docs: def sign(ctx, file, account):
      """ Sign a message with an account
      """
      if not file:
          # click.echo("Prompting for message. Terminate with CTRL-D")
          file = click.get_text_stream("stdin")
      m = Message(file.read(), peerplays_instance=ctx.peerplays)
      click.echo(m.sign(account))